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How to create a JPA application using Google's datastore in Eclipse? What are the steps to create a Google App Engine application in Eclipse?

+1  A: 

First, install the Google Plugin for Eclipse. Second, check Getting Started: Java and especially Creating a Project. Follow the documented steps. Third, jump to Using JPA with App Engine.

Pascal Thivent
http://code.google.com/appengine/docs/java/datastore/usingjpa.htmlya i already refer that link in that they gave steps to create JPA application.But in eclipse on option is there (i.e) file-->new-->JPA Project.like that i created one jpa project .But in that no war files .
@megala I don't mean to be rude but I provided you all the pointers. I told you to check the "Getting Started: Java" guide, there is a "Create a Project" section (I added a link to it but everything you need was already there). If you are beginning with GAE, you should do things by the book. If you don't, expect some troubles.
Pascal Thivent
@Pascal: you should require a remote desktop access and set it up :) (+1)
Bozho